Lathe.



J." B. STANWOOD & H. M. n'ousmm.

"LATHE.

APPLEATION FILED DEC-7| I916.

Patented J U137 31, 1917.

2 SHEETS-SHEET I NVEN 70/65 M 233M w B y M A TT NE Y J. B. STANWOOD & H. M. HOUSTON.

LATHE.

APPLICATION HLED DEC,7,1916.

1,235,893 Patented July 31, 1917;

2 SHEETS-SHEET 2.

UNITED STATES PATENT onnron JAMES B. STANWOOD, 0F CINCINNATI, OHIO, AND HERMAN M. HOUSTON, OF COVING- TON, KENTUCKY, ASSIGNORS TO THE HOUSTON, STANWOOD & GAMBLE COMPANY, OF GOVINGTON, KENTUCKY, A CORPORATION OF OHIO.

LATHE.

Specification of Letters Patent.

Patented July 31, 1917.

Application filed December 7, 1916. Serial No. 135,681.

To all whom it may concern:

Be it known that we, JAMES B. S'rANwoon and HERMAN M. HOUSTON, citizens of the United States, JAMEs B. S'rANwooD residing at Cincinnati, in the county of Hamilton and State of Ohio, and HERMAN M. Hous- TON residing at Covington, in the county of Kenton and State of Kentucky, have invented new and useful Improvements in Lathes, of which the following is a specification.

Our invention relates to turning lathes and more particularly to what are often called profile attachments therefor; its object being to provide a novel, simplified and efiicient construction enabling the cutting tool to act upon and complete both a straight cylindrical surface and a curved surface, successively, at one and the same operation without pause. While the illustration of the invention herein given shows its application to so-called conical shells for military use, formed with a cylindrical body terminating in a curved end or point, it may be otherwise applied and to a variety of uses.

To the end indicated, the invention is embodied in a novel combination and arrangement, with the carriage and tool slide-rest, of a pivot slide-plate, movable but normally held in fixed position upon the carriage and moving with it as one; a link or radius bar having terminal connections by fixed pivots with the pivot slide-plate and the transverse tool-slide-rest; an adjustable buffer or arresting stop in the path of the pivot slideplate; and a gravity weight operating as a yielding connection (as to longitudinal inter movement) between the carriage and pivot slide-plate, whereby the arresting stop holds the pivot slide-plate stationary while the carriage goes on without pause to the completion of its function as permitted by the yielding'weight, which latterresumes its stated function upon return of the carriage to and beyond the point of arrest of the pivot slide-plate, in the receding movement to the original starting position.

The accompanying drawings illustrate the appllcation of our invention to an ordinary bed lathe used for turning so-called conical shells or objects of like form in part cylindrical and in'part centripetally curved. In these,

Figure 1 is a plan view Fig. 2, a side elevation; and- Fig. 3, a cross section of the lathe, embodying the invention.

The body being operated upon, is indicated by dotted linesin Fig. 1, a side View, and in Fig. '3, an end view.

A designates the lathe-bed,embodying a pair of parallel guide-ways, a, a, with usual supports; and a (E, the headstock and tailstock, respectively, adjustable upon the guide-ways, a, a, to the work in hand. B designates the carriage, fitted to engage and move independently upon the guide-ways, a, a, in the usual manner by connection with a screw shaft (not shown), or otherwise; and itself provided with the usual transverse slide-rest, Z), for support and adjustment of a tool-post (not shown). Except as hereinafter explained, all these parts are of the usual type and require no detailed description.

Upon the end'portion of the carriage, B, opposite the position of the tool-post, a guide-bar, 0 is fixedly attached, parallel with the lathe-bed guide-ways, and constituting a fixed guide for a sliding plate, C, as a pivot support, provided with a raised abutment, c and adapted to move upon the guidebar, 72 in the same direction as the carriage, B. The pivot slide plate, C, car ries at its upper face a fixed pivot-stud, p and a like pivotstud, 79 is affixed to the opposite slide plate, 7), of the carriage these pivots being engaged and connected across the lathe bed, A, by a bar or link, 1).

As will be seen in Fig. 1, when the pivot slide plate, O, is held in mid-position in relation to the carriage, B, the link D, stands at right angles with the lathe-bed guides, a, and in the line of movement of the tool slide rest, Z); and the cutting tool produces a cylindrical surface. At the rear outer side of the carriage, B, at a point beyond the desired limit of forward movement of the pivot slide plate, C, is fixedly secured a depending bracket, 6, provided with a fixed stud, 6 carrying a grooved idler-pulley, E, over which passes a cord or chain, '7, fastened at one end to the pivot slide plate, C, as at 0 and carrying at its other end a free weight, F. Thus the pivot slide-plate, C, is, by the action of the weight, normally held in fixed relations with the carriage, B, by forced contact with a suit able stop upon the carriage,ras the bracket, e,--while moving with the main slide-rest, B, as a relatively fixed part thereof. For convenience of exact adjustment, actual contact against said stop is taken upon the head of an adjustable screw bolt, 6 seated in the contiguous face of the bracket, 0, as shown.

Thus during all movement of the carriage and the pivot slide-plate, the latter, with its fixed pivot, is functionally a fixed part of the carriage by the action of the holding weight, which partakes of the same motion; and the cuttingtool acts in the ordinary manner to produce a cylindrical surface upon an object such as indicated by the dotted lines in Fig. 1.

In order to cause the tool to act upon the curved surface, an adjust-able stop, Gr,is provided, which, for convenience, may be the terminal head of a rod or bar, 9, horizontally adjustable in a bracket, fixedly to the lathe bed at a convenient point and situated in the path of some part of the pivot slideplate, C, as an abutment, c raised thereon. This arrests the motion of the pivot slide plate at the point of beginning the curvature of the work-face,the carriage, l3, meanwhile continuing its forward motion until arrested at completion of the work. In receding, the carriage, I3, for the beginning of new work, the pivot slideplate, C, remains fixedly in its arrested position until the bolt, 6 again contacts with the plate, C, which is thence carried backward by the carriage, I3; and the weight maintains this contact connection, and thereby maintains the link, I), rigidly in the normal position shown in Fig. 1.

7 The mode of operation in passing from the straight cylindrical portion of the work to the curved portion, hereinbefore. described, is automatic and the action ofthe cutting tool continuous.

. In the drawings and foregoing description, the parts, are arranged for motion of the carriage from the tail-stock toward the se :ured' head-stock; but by the change of the posi tion of the pulley and weight and extension of rod, 9, and its head, G, to the opposite side of the carriage as indicated by dotted lines, the reverse movement is provided for.

We claim as our invention and desire to secure by Letters Patent of the United States:

l. A bed-lathe of the character indicated, embodying, in combination with the main slide-rest and its tool-rest movable trans versely thereon, a. pivot slide-plate movable upon the carriage in'the latters line of movement; a link having fixed pivotal connection with the tool-rest and the pivot slide-plate; means for retaining the pivot slide plate normally in fixed relations with the carriage so as to move together as one; and means for arresting the movement of the pivot slideplate at a given point and holding the same stationary while the carriage continues on without interruption beyond said point.

A bed-lathe of the character indicated,

embodying in combination with the carriage and its tool-rest movable transversely thereon, a pivot slide-plate movable upon the carriage in the latters line of movement; a link having fixed pivotal connections with the tool-rest and with the pivot slide-plate; means for retaining the pivot slide-plate normally connected in fixed relations ofunitary movement with the carriage; means for arresting the movement of the pivot slideplate at a given point and holding same stationary while the carriage continues on without interruption beyond said point; and means for restablishing the normal relations of unitary motion upon return of the carriage to the point of arrestand durin its opposite travel beyond same.

3. In a lathe of the character indicated, the combination of a carriage; an" idlerpulley attached thereto; a pivotplate slid ably mounted upon the carriage in'its line of travel and normally movable therewith; a weight attached to the pivot slide-plate through the medium of the idler pulley and ai'stop adapted to arrest the movement of the slide plate at a given point while permitting the carriage to continue its travel.

st. In a. lathe of the character indicated, a carriage provided with'a movable. toolrest, apivot-plate slidably mounted upon the carriage in the latters line of travel and normally movable therewith and provided with a fixed pivot stud; and a link or radius bar pivotally carried at one end upon said fixed stud and pivotally connected at the other with the tool-rest and an adjustable stop arranged to arrest the movement of the slide plate at a desired point independentlv of the carriage movement. In a lathe of the character indicated the combination of a carriage; an idler pulregulating the positional relation of the carley attached thereto; a pivot-plate slidably riage and the pivot slide plate in the normal mounted upon the carriage and normally movement of the plate with the carriage. 10 movable therewith; a weight attached to the In testimony whereof we have hereunto pivot slide-plate through the medium of the set our hands.

idler pulley; and an adjustable distance stop JAMES B. STANWOOD.

upon the carriage as a contact abutment for HERMAN M. HOUSTON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of 2atents, Washington, D. G. 

